Qt简单屏幕截图(兼容Qt4/5)

• Qt4使用QPixmap::grabWindow接口获取指定屏幕;
• Qt5使用QScreen 的grabWindow接口获取指定屏幕;
• QApplication::desktop()获取根窗口;
• QUuid::createUuid()产生唯一ID;
• pixmap.save(name)保存截图到本地.

main.cpp

#include <QApplication>
#include <QDesktopWidget>
#include <QScreen>
#include <QPixmap>
#include <QUuid>
#include <QDateTime>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
    QPixmap pixmap = QPixmap::grabWindow(QApplication::desktop()->winId());
#else if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
    QScreen *screen = QGuiApplication::primaryScreen();
    QPixmap pixmap = screen->grabWindow(QApplication::desktop()->winId());
#endif

    QString name = QString("%1-%2.png").
            arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss")).
            arg(QUuid::createUuid().toString());

    pixmap.save(name);

    return 0;
}

qmake文件

QT += core

equals(QT_MAJOR_VERSION, 5) : QT += widgets

CONFIG -= app_bundle
TARGET = Screenshot

TEMPLATE = app

SOURCES += main.cpp